Flame Spread Index of Wood

[jar546]

Some of you may be surprised, some of you not. Here it is. The lower the number the better.

Southern Yellow Pine 130-195
Cypress 145-150
Northern White Pine 120-215
Ponderosa Pine 105-130
Doug Fir 70-100
OSB 150

Western Larch 45
Cedar Alaskan Yellow 50

 

[RLGA]

A good resource that I have found is this document from the American Wood Council: https://www.awc.org/codes-standards/publications/dca1